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lock.h revision 1.2.10.2 
      1  1.2.10.2  jdolecek /*	$NetBSD: lock.h,v 1.2.10.2 2002/10/10 18:35:43 jdolecek Exp $	*/
      2       1.1   thorpej 
      3       1.1   thorpej /*-
      4  1.2.10.2  jdolecek  * Copyright (c) 2002 The NetBSD Foundation, Inc.
      5       1.1   thorpej  * All rights reserved.
      6       1.1   thorpej  *
      7       1.1   thorpej  * This code is derived from software contributed to The NetBSD Foundation
      8  1.2.10.2  jdolecek  * by Gregory McGarry.
      9       1.1   thorpej  *
     10       1.1   thorpej  * Redistribution and use in source and binary forms, with or without
     11       1.1   thorpej  * modification, are permitted provided that the following conditions
     12       1.1   thorpej  * are met:
     13       1.1   thorpej  * 1. Redistributions of source code must retain the above copyright
     14       1.1   thorpej  *    notice, this list of conditions and the following disclaimer.
     15       1.1   thorpej  * 2. Redistributions in binary form must reproduce the above copyright
     16       1.1   thorpej  *    notice, this list of conditions and the following disclaimer in the
     17       1.1   thorpej  *    documentation and/or other materials provided with the distribution.
     18       1.1   thorpej  * 3. All advertising materials mentioning features or use of this software
     19       1.1   thorpej  *    must display the following acknowledgement:
     20       1.1   thorpej  *	This product includes software developed by the NetBSD
     21       1.1   thorpej  *	Foundation, Inc. and its contributors.
     22       1.1   thorpej  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23       1.1   thorpej  *    contributors may be used to endorse or promote products derived
     24       1.1   thorpej  *    from this software without specific prior written permission.
     25       1.1   thorpej  *
     26       1.1   thorpej  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27       1.1   thorpej  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28       1.1   thorpej  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29       1.1   thorpej  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30       1.1   thorpej  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31       1.1   thorpej  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32       1.1   thorpej  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33       1.1   thorpej  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34       1.1   thorpej  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35       1.1   thorpej  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36       1.1   thorpej  * POSSIBILITY OF SUCH DAMAGE.
     37       1.1   thorpej  */
     38       1.1   thorpej 
     39       1.1   thorpej /*
     40       1.1   thorpej  * Machine-dependent spin lock operations.
     41       1.1   thorpej  */
     42       1.1   thorpej 
     43       1.1   thorpej #ifndef _SH3_LOCK_H_
     44       1.1   thorpej #define	_SH3_LOCK_H_
     45       1.2   thorpej 
     46       1.2   thorpej typedef	__volatile int		__cpu_simple_lock_t;
     47       1.1   thorpej 
     48  1.2.10.2  jdolecek #define	__SIMPLELOCK_LOCKED	0x80
     49       1.1   thorpej #define	__SIMPLELOCK_UNLOCKED	0
     50  1.2.10.2  jdolecek 
     51  1.2.10.2  jdolecek static __inline void __cpu_simple_lock_init __P((__cpu_simple_lock_t *))
     52  1.2.10.2  jdolecek 	__attribute__((__unused__));
     53  1.2.10.2  jdolecek static __inline void __cpu_simple_lock __P((__cpu_simple_lock_t *))
     54  1.2.10.2  jdolecek 	__attribute__((__unused__));
     55  1.2.10.2  jdolecek static __inline int __cpu_simple_lock_try __P((__cpu_simple_lock_t *))
     56  1.2.10.2  jdolecek 	__attribute__((__unused__));
     57  1.2.10.2  jdolecek static __inline void __cpu_simple_unlock __P((__cpu_simple_lock_t *))
     58  1.2.10.2  jdolecek 	__attribute__((__unused__));
     59  1.2.10.2  jdolecek 
     60  1.2.10.2  jdolecek static __inline void
     61  1.2.10.2  jdolecek __cpu_simple_lock_init(__cpu_simple_lock_t *alp)
     62  1.2.10.2  jdolecek {
     63  1.2.10.2  jdolecek 
     64  1.2.10.2  jdolecek 	*alp = __SIMPLELOCK_UNLOCKED;
     65  1.2.10.2  jdolecek }
     66  1.2.10.2  jdolecek 
     67  1.2.10.2  jdolecek static __inline void
     68  1.2.10.2  jdolecek __cpu_simple_lock(__cpu_simple_lock_t *alp)
     69  1.2.10.2  jdolecek {
     70  1.2.10.2  jdolecek 
     71  1.2.10.2  jdolecek 	 __asm __volatile(
     72  1.2.10.2  jdolecek 		"1:	tas.b	%0	\n"
     73  1.2.10.2  jdolecek 		"	bf	1b	\n"
     74  1.2.10.2  jdolecek 		: "=m" (*alp));
     75  1.2.10.2  jdolecek }
     76  1.2.10.2  jdolecek 
     77  1.2.10.2  jdolecek static __inline int
     78  1.2.10.2  jdolecek __cpu_simple_lock_try(__cpu_simple_lock_t *alp)
     79  1.2.10.2  jdolecek {
     80  1.2.10.2  jdolecek 	int __rv;
     81  1.2.10.2  jdolecek 
     82  1.2.10.2  jdolecek 	__asm __volatile(
     83  1.2.10.2  jdolecek 		"	mov	#1, r1	\n"
     84  1.2.10.2  jdolecek 		"	mov.l	r1, %1	\n"
     85  1.2.10.2  jdolecek 		"	tas.b	%0	\n"
     86  1.2.10.2  jdolecek 		"	bt	1f	\n"
     87  1.2.10.2  jdolecek 		"	mov	#0, r1	\n"
     88  1.2.10.2  jdolecek 		"	mov.l	r1, %1	\n"
     89  1.2.10.2  jdolecek 		"1:			\n"
     90  1.2.10.2  jdolecek 		: "=m" (*alp), "=m" (__rv) :: "r1");
     91  1.2.10.2  jdolecek 
     92  1.2.10.2  jdolecek 	return (__rv);
     93  1.2.10.2  jdolecek }
     94  1.2.10.2  jdolecek 
     95  1.2.10.2  jdolecek static __inline void
     96  1.2.10.2  jdolecek __cpu_simple_unlock(__cpu_simple_lock_t *alp)
     97  1.2.10.2  jdolecek {
     98  1.2.10.2  jdolecek 
     99  1.2.10.2  jdolecek 	*alp = __SIMPLELOCK_UNLOCKED;
    100  1.2.10.2  jdolecek }
    101       1.1   thorpej 
    102  1.2.10.1  jdolecek #endif /* !_SH3_LOCK_H_ */
    103